Effect of carrier distribution on superconducting characteristics of the multilayered high-Tc cuprate (Cu0.6C0.4)Ba2Ca3Cu4O12+y: 63Cu−NMR study
Y. Tokunaga, K. Ishida, Y. Kitaoka, K. Asayama, K. Tokiwa, A. Iyo, H. Ihara
DOI 10.1103/PhysRevB.61.9707 · Physical Review B
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Abstract
We report Cu-NMR studies of the multilayered high-Tc cuprate (Cu0.6C0.4)Ba2Ca3Cu4O12+y (Cu1234) with Tc=117 K. In the normal state, the Knight shift (K) and the nuclear spin-lattice relaxation rate (1/T1) of 63Cu give evidence that the inner CuO2 planes (IP) are underdoped, whereas the outer ones (OP) are heavily overdoped. In the superconducting (SC) state, both K and 1/T1 decrease markedly below Tc=117 K in the IP, whereas in the OP they decrease moderately below Tc=117 K, but markedly below Tc2=60 K. The unusual NMR results in the OP reveal that the SC gap does not fully develop down to Tc2=60 K. From comparison with a conventional d-wave model, it is shown that the SC gap in the OP increases linearly below Tc and follows the mean-field type of T dependence below Tc2. We propose that these dissimilarities are caused by the large difference of doping levels between the IP and the OP. The bulk SC transition at Tc=117 K is considered to be triggered by the underdoped IP in Cu1234.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Cu0.6C0.4)Ba2Ca3Cu4O12+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 117 | Pressure not reported | onset |
| (Cu0.6C0.4)Ba2Ca3Cu4O12+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 117 | Pressure not reported | onset |
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